''Cystoseira'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

brown alga Brown algae (singular: alga), comprising the class (biology), class Phaeophyceae, are a large group of multicellular algae, including many seaweeds located in colder waters within the Northern Hemisphere. Brown algae are the major seaweeds of the ...

e in the order

Fucales The Fucales (fucoids) are an order in the brown algae (class Phaeophyceae). The list of families in the Fucales, as well as additional taxonomic information on algae, is publicly accessible at Algaebaseref name="Guiry and Guiry">Guiry, M.D. and ...

Description

''Cystoseira'' is characterized by highly differentiated basal and apical regions and the presence of catenate

pneumatocyst In phycology, a pneumatocyst is a floating structure that contains gas found on brown seaweed. A seaweed's thallus may have more than one. They provide buoyancy to lift the blades toward the surface, allowing them to receive more sunlight for ph ...

s (air-vesicles). In ''Cystoseira'' old plants have an elongated main axis, and in time the primary laterals become proportionally elongated. Their lower parts are strongly flattened into ‘foliar expansions’ or basal leaves. Fertile regions which bear

conceptacle Conceptacles are specialized cavities of marine and freshwater algae that contain the reproductive organs. They are situated in the receptacle and open by a small ostiole.Boney, A.D. (1969). ''A Biology of Marine Algae''. Hutchinson Educational L ...

s are known as receptacles. These are normally found at the tips of the branches. Their basal and apical regions are highly differentiated. They have catenate pnuematocysts (air vesicles). The aerocyst or air vesicles keep the organism erect, by causing it to float in strong currents.

Distribution

''Cystoseira'' is one of the most widely distributed genera of the Fucales order and provides an essential habitat for many epiphytes, invertebrates, and fish. ''Cystoseira'' is found mostly in temperate regions of the Northern Hemisphere, such as the Mediterranean, Indian, and Pacific Oceans.

Bioindicators

''Cystoseira'' depend on good water quality, and can be used for bioindication. This was discovered in a study of ''Cystoseira'' species undertaken on

Menorca Menorca or Minorca (from la, Insula Minor, , smaller island, later ''Minorica'') is one of the Balearic Islands located in the Mediterranean Sea belonging to Spain. Its name derives from its size, contrasting it with nearby Majorca. Its capi ...

Species

The following

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

are listed in the World Register of Marine Species: *'' Cystoseira abies-marina'' (S.G.Gmelin) C.Agardh, 1820 *'' Cystoseira algeriensis'' Feldmann, 1945 *'' Cystoseira amentacea'' (C.Agardh) Bory de Saint-Vincent, 1832 *'' Cystoseira baccata'' (S.G.Gmelin) P.C.Silva, 1952 *''

Cystoseira barbata ''Cystoseira'' is a genus of brown algae in the order Fucales. Description ''Cystoseira'' is characterized by highly differentiated basal and apical regions and the presence of catenate pneumatocysts (air-vesicles). In ''Cystoseira'' old plants ...

'' (Stackhouse) C.Agardh, 1820 *'' Cystoseira barbatula'' Kützing *'' Cystoseira brachycarpa'' J.Agardh, 1896 *''

Cystoseira compressa ''Cystoseira'' is a genus of brown algae in the order Fucales. Description ''Cystoseira'' is characterized by highly differentiated basal and apical regions and the presence of catenate pneumatocysts (air-vesicles). In ''Cystoseira'' old plants ...

'' (Esper) Gerloff & Nizamuddin, 1975 *''

Cystoseira corniculata ''Cystoseira'' is a genus of brown algae in the order Fucales. Description ''Cystoseira'' is characterized by highly differentiated basal and apical regions and the presence of catenate pneumatocysts (air-vesicles). In ''Cystoseira'' old plants ...

'' (Turner) Zanardini, 1841 *'' Cystoseira crassipes'' (Mertens ex Turner) C.Agardh, 1821 *''

Cystoseira crinita ''Cystoseira'' is a genus of brown algae in the order Fucales. Description ''Cystoseira'' is characterized by highly differentiated basal and apical regions and the presence of catenate pneumatocysts (air-vesicles). In ''Cystoseira'' old plants ...

'' Duby, 1830 *''

Cystoseira crinitophylla ''Cystoseira'' is a genus of brown algae in the order Fucales. Description ''Cystoseira'' is characterized by highly differentiated basal and apical regions and the presence of catenate pneumatocysts (air-vesicles). In ''Cystoseira'' old plants ...

'' Ercegovic, 1952 *''

Cystoseira dubia ''Cystoseira'' is a genus of brown algae in the order Fucales. Description ''Cystoseira'' is characterized by highly differentiated basal and apical regions and the presence of catenate pneumatocysts (air-vesicles). In ''Cystoseira'' old plants ...

'' Valiante *'' Cystoseira elegans'' Sauvageau, 1912 *''

Cystoseira fimbriata ''Cystoseira'' is a genus of brown algae in the order Fucales. Description ''Cystoseira'' is characterized by highly differentiated basal and apical regions and the presence of catenate pneumatocysts (air-vesicles). In ''Cystoseira'' old plants ...

'' Bory de Saint-Vincent, 1832 *'' Cystoseira foeniculacea'' (Linnaeus) Greville, 1830 *''

Cystoseira funkii ''Cystoseira'' is a genus of brown algae in the order Fucales. Description ''Cystoseira'' is characterized by highly differentiated basal and apical regions and the presence of catenate pneumatocysts (air-vesicles). In ''Cystoseira'' old plants ...

'' Schiffner ex Gerloff & Nizamuddin, 1976 *''

Cystoseira geminata ''Cystoseira'' is a genus of brown algae in the order Fucales. Description ''Cystoseira'' is characterized by highly differentiated basal and apical regions and the presence of catenate pneumatocysts (air-vesicles). In ''Cystoseira'' old plants ...

'' C.Agardh, 1824 *''

Cystoseira hakodatensis ''Cystoseira'' is a genus of brown algae in the order Fucales. Description ''Cystoseira'' is characterized by highly differentiated basal and apical regions and the presence of catenate pneumatocysts (air-vesicles). In ''Cystoseira'' old plants ...

'' (Yendo) Fensholt, 1952 *''

Cystoseira helvetica ''Cystoseira'' is a genus of brown algae in the order Fucales. Description ''Cystoseira'' is characterized by highly differentiated basal and apical regions and the presence of catenate pneumatocysts (air-vesicles). In ''Cystoseira'' old plants ...

'' Heer, 1877 *''

Cystoseira humilis ''Cystoseira'' is a genus of brown algae in the order Fucales. Description ''Cystoseira'' is characterized by highly differentiated basal and apical regions and the presence of catenate pneumatocysts (air-vesicles). In ''Cystoseira'' old plants ...

'' Schousboe ex Kützing, 1860 *'' Cystoseira hyblaea'' G.Giaccone, 1985 *'' Cystoseira indica'' (Thivy & Doshi) Mairh, 1968 *'' Cystoseira jabukae'' Ercegovic, 1952 *'' Cystoseira mauritanica'' Sauvageau, 1911 *'' Cystoseira mediterranea'' Sauvageau, 1912 *'' Cystoseira montagnei'' J.Agardh, 1842 *'' Cystoseira neglecta'' Setchell & N.L.Gardner, 1917 *'' Cystoseira nodicaulis'' (Withering) M.Roberts, 1967 *'' Cystoseira osmundacea'' (Turner) C.Agardh, 1820 *'' Cystoseira pelagosae'' Ercegovic, 1952 *'' Cystoseira planiramea'' Schiffner *'' Cystoseira platyclada'' Sauvageau, 1912 *'' Cystoseira rayssiae'' E.Ramon, 2000 *'' Cystoseira sauvageauana'' G.Hamel, 1939 *'' Cystoseira sauvageaueana'' G.Hamel, 1939 *'' Cystoseira schiffneri'' G.Hamel, 1939 *'' Cystoseira sedoides'' (Desfontaines) C.Agardh, 1820 *'' Cystoseira selaginioides'' *'' Cystoseira setchellii'' N.L.Gardner, 1913 *'' Cystoseira sonderi'' (Kützing) Piccone *'' Cystoseira spinosa'' Sauvageau, 1912 *'' Cystoseira squarrosa'' De Notaris, 1841 *'' Cystoseira stricta'' *'' Cystoseira susanensis'' Nizamuddin, 1985 *'' Cystoseira tamariscifolia'' (Hudson) Papenfuss, 1950 *'' Cystoseira trinodis'' (Forsskål) C.Agardh, 1820 *'' Cystoseira usneoides'' (Linnaeus) M.Roberts, 1968 *'' Cystoseira wildpretii'' Nizamuddin, 1995 *'' Cystoseira wildprettii'' Nizamuddin *'' Cystoseira zosteroides'' C.Agardh, 1820

References

* * {{Taxonbar, from=Q2586432 Fucales Fucales genera Taxa named by Jacob Georg Agardh